JP3221534B2 - Magnetic head drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head driving device in which a head main body is moved on a recording medium, such as a floating magnetic head, and more particularly, to a conductive connection between a head main body and external wiring. The present invention relates to a magnetic head drive device as described above.

[0002]

2. Description of the Related Art FIG. 8 is a plan view showing a drive device of a floating magnetic head mounted on a hard disk drive, and FIG.
FIG. 10 is an enlarged side view showing the head main body support portion in the direction of the arrow IX. In the hard disk device shown in FIG. 8 and FIG.
Are supported so as to be driven to rotate, and a head assembly H is provided on both upper and lower surfaces of each disk D. In each head assembly H, the head main body 1 is attached to the tip of the support member P. As shown in an enlarged manner in FIG. 10, the head main body 1 has a slider 1a, a core 1b joined to the slider 1a, and a coil 2 wound around the core 1b, and a joint between the slider 1a and the core 1b. A magnetic gap G serving as a magnetic function part is formed at the bottom. The support member P includes a flexure 3 and a load beam 4. The flexure 3 is formed of a thin leaf spring material and has a joint 3a and a support 3b. The slider 1a of the head body 1 is adhered to the lower surface of the joint 3a of the flexure 3, and the support 3b of the flexure 3
Is fixed to the bottom surface 4a of the load beam 4 by means such as welding. The joint 3a of the flexure 3 is integrally formed with a spherical pivot 3c, and the upper end of the pivot 3c is in contact with the bottom surface 4a of the load beam 4.

The load beam 4 is made of a leaf spring material having a plate thickness larger than that of the flexure 3, and has folded portions 4b on both sides from an intermediate position to a front portion, and this portion has rigidity. It has a structure.
A portion of the base of the load beam 4 where the folded portions 4b, 4b are not provided is a leaf spring function portion 4c. The portion of the load beam 4 at the rear end from the leaf spring function portion 4c is a flat fixing portion 4d.
, A plate-shaped mount member 7 is joined. The head body 1 is pressed against the surface of the disk D by the weak elastic force of the leaf spring function part 4c. When the disk D rotates, a flying force is applied to the slider 1a by the airflow on the disk surface, and the head body 1 floats from the disk surface in the posture shown in FIG. Recording or reproduction is performed on the disk surface by the magnetic gap G, which is a magnetic function part.

The head driving member 8 rotates about a shaft 8a. As shown in FIG. 9, the head driving member 8 is provided with a plurality of driving arms 9, 9,. The mount member 7 is fixed to the tip of each drive arm 9 by caulking means or press fitting. The head driving member 8 is rotated about the shaft 8a by a magnetic driving means or the like, whereby the head body 1 facing the disk surface in the floating posture moves from the inner circumference to the outer circumference of the disk D. A lead wire 5 extending from the coil 2 of the head body 1 is guided by a load beam 4 and inserted into a tube 6. The tube 6 into which the lead wire 5 has been inserted is fixed to the fixed claws 4e in the load beam 4, and further guided to the side surface of the drive arm 9 and fixed by the fixed claws 9a. A printed circuit board 10 is attached to a side surface of the head driving member 8, and tips of the lead wires 5 drawn from the plurality of head bodies 1, 1 are soldered to lands 10 a, 10 a of the printed circuit boards 10, 10. The coil of each head body is connected to an external circuit.

[0005]

However, the conventional magnetic head drive has the following problems. Since the tube 6 into which the lead wire 5 has been inserted is extended over the load beam 4 to the side of the drive arm 9, the fixing claws 4e, 9 for fixing the tube 6 are provided.
a is required. The provision of the fixing claws complicates the shape of each component and complicates the wiring fixing operation.

Since the lead wire 5 extends a long distance to the base of the drive arm 9, external noise is likely to be superimposed on the lead wire 5. Since the frequency of a recording / reproducing signal is high in a recent high-density recording disk device or the like, superposition of external noise on the lead wire 5 tends to deteriorate the accuracy of the recording or reproducing signal.

[0007] Recently, a thin film element constituting the magnetic function portion is formed on the slider 1a. However, when a thin film element is used in a conventional wiring structure, the thin film element formed on the slider is not used. Then, the lead wire 5 is connected to the terminal portion, and the lead wire is further extended and soldered to the land portion 10a of the printed circuit board 10, so that the wiring processing work becomes very complicated.

The structure of the head driving member 8 and the driving arm 9
The length of the lead wire 5 differs depending on the model, and the wiring length of the lead wire 5 differs depending on the model. When the common head assembly H is used for different models, it is necessary to lengthen the lead wire 5 and the tube 6 in advance in preparation for a difference in wiring length, and to cut the lead wire 5 and the tube 6 according to each model. Will be needed. Therefore, assembling work process increases,
There is a disadvantage that the lead wire and the tube to be cut are wasted. Alternatively, when manufacturing the head assembly H, it is necessary to cut the lead wire 5 and the tube 6 to predetermined lengths according to the model to be attached, and remove the coating on the tip of the lead wire 5. Therefore, the assembling work is very complicated.

When the head assembly H is completed, since the lead wire 5 and the tube 6 are extended long, the lead wire may be entangled with other lead wires during storage and assembly work, thereby reducing work efficiency. There is a drawback that gets worse.

The present invention has been made to solve the above-mentioned problems, and provides a magnetic head driving device which can simplify wiring from a magnetic function portion of a head body to the outside and can be adapted to different models. It is intended to be.

[0011]

According to the present invention, there is provided a magnetic head drive apparatus comprising: a head body facing a recording medium; a support member having a head body attached to a leading end; and a base for supporting the base of the support member. In a magnetic head driving device provided with a driving member for moving a head main body along a recording medium, a plurality of electrode patterns for conducting to a magnetic function portion of the head main body are provided at a base of the support member, and an external wiring is provided for the driving member. A plurality of electrode patterns that are electrically connected to each other are formed, and between the base of the support member and the drive member, the base of the support member approaches the drive member in a direction perpendicular to the surface on which the electrode pattern is provided. A concave and convex fitting portion for making the concave and convex fitting is provided, and when the base of the support member is assembled in a direction in which the concave and convex fitting portion is fitted to the driving member, the support member With base is positioned on the drive member, said plurality of electrode patterns each other is, the uneven fitting portion is facing pressure from the fitting direction, the support portion
When the base of the material and the driving member are fixed,
The pole patterns are electrically connected to each other . The present invention also provides a head book facing a recording medium.
A body, a support member having a head body attached to the tip,
The head body is supported by supporting the base of the support member and the recording medium is supported.
A magnetic head provided with a driving member for moving the body.
In the head drive device, the base of the support member is
The plurality of electrode patterns that conduct to the magnetic function part are
Has multiple electrode patterns that conduct to external wiring.
Between the base of the support member and the drive member.
The support in a direction perpendicular to the surface on which the electrode pattern is provided.
The base of the member is brought close to the driving member so that
The concave and convex fitting part with the caulking part
The base of the support member is configured such that
When the concave / convex fitting part is assembled in the fitting direction,
When the base of the supporting member is positioned on the driving member,
In addition, the plurality of electrode patterns are fitted with the concave and convex
Part is facing pressure from the fitting direction, or the crimped portion
By tightening, the base of the support member and the driving member are fixed, and at the same time, the electrode patterns are electrically connected.
It is characterized by being connected. Or the original
The head has a head body facing the recording medium and a head
A support member body was Ri attached taken, the base of the support member
And moving the head body along the recording medium.
A magnetic head driving device provided with a driving member
The base of the support member is electrically connected to the magnetic function section of the head body.
Multiple electrode patterns are connected to the external wiring on the drive member.
A plurality of electrode patterns passing therethrough are formed;
The electrode pattern is provided between the base and the driving member.
Drive the base of the support member in a direction perpendicular to the
An uneven fitting part is provided to make uneven fitting close to the moving member.
And the base of the support member is positioned relative to the drive member.
When the concave and convex fitting part is assembled in the fitting direction
The base of the support member is positioned on the drive member.
And the plurality of electrode patterns are
The convex fitting portion is face-to-face pressed from the fitting direction, and the press-fitting of the concave-convex fitting portion fixes the base of the support member and the driving member, and at the same time conducts the electrode patterns.
It is characterized by being connected. In the above case,
A press-fit portion is formed at the base of the support member, and a through-hole is formed in the drive member to form the concave-convex fitting portion. The press-fit portion is press-fitted from both ends of the through-hole. Thus, it is possible to adopt a structure in which the bases of the support members are respectively attached to both sides of the drive member.

[0012]

In the above means, the lead wire or the lead pattern extending from the magnetic function portion of the head main body is electrically connected to the electrode portion at the base of the support member. Therefore, when the head assembly is completed, there are no lead wires extending from the head assembly,
Longer leads do not extend from the head assembly as in the prior art. When attaching the head assembly to a driving member such as a driving arm, the supporting member of the head assembly is attached to the driving member by caulking or press-fitting using a concave and convex fitting portion, and the electrode pattern on the supporting member side and the driving member side Electrode
The pattern and the pattern are reliably brought into face-to-face contact and joined. Further, at this time, the base of the support member is reliably positioned on the drive member by the concave-convex fitting portion.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially exploded perspective view of a magnetic head drive device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view showing a state of attachment between a top head assembly and a drive arm, and FIG. FIG. FIG. 1 shows a magnetic head drive of a hard disk drive. As shown in FIGS. 8 and 9, in the hard disk device, a plurality of disks D are stored, and these disks are driven to rotate. The head assembly 21 faces both the front and back surfaces of each disk D. In FIG. 1, a plurality of head assemblies 2 are shown.
10 shows the mounting structure of the head assembly 21 facing the uppermost one of the disks, that is, the upper surface of the uppermost disk shown in FIG .

The head assembly 21 has a head body 22 and a support member 23 for supporting the head body 22. In the uppermost head assembly 21 shown in FIGS.
2 is downward. The head body 22 includes a slider 22a.
A coil C is wound around the core 22b, and a magnetic gap G is formed at a joint between the slider 22a and the core 22b. The support member 23 includes a flexure 24 and a load beam 25, and the upper surface of the slider 22 a of the head main body 22 is bonded to the flexure 24. The flexure 24 is a load beam 25
Is fixed by welding or the like. The load beam 25 is folded back from the middle part to the front part.
A rigid portion 5a is formed, and a rear end portion serves as a leaf spring function portion 25b and a fixing portion 25c. A mounting member 26 is provided on the lower surface of the fixing portion 25c of the load beam 25.
Is fixed by means such as welding, and a cylindrical caulking portion 27 is formed to project from an intermediate portion of the mount member 26.
The caulking portion 27 protrudes upward in the drawing from a hole formed in the fixing portion 25c of the load beam 25.

A printed circuit board 28 on a film is adhered to the upper surface of the fixing portion 25c of the load beam 25 in the drawing. Four electrode patterns 2 are provided on the surface of the printed circuit board 28.
, Land patterns 28c, 28c located at the edge of the substrate, and lead patterns 28b connecting the respective electrode patterns 28a and land patterns 28c.
28b are formed. The coated copper wire of the coil C wound around the core 22b of the head main body 22 is extended as it is to become lead wires 29, 29. As shown in FIGS. 2 and 3, the lead wires 29, 29.
a, 29a, is guided to the upper surface of the load beam 25, and the tip of the lead wire is connected to the land pattern 28c, 2a.
8c are soldered. The head assembly 21, in which the head body 22, the flexure 24, the load beam 25, and the mount member 26 are assembled, is managed and stored as it is as a semi-finished product. Is completed, the head assembly 2
1, the lead wire in the free state as in the prior art does not extend. Therefore, during management and storage, there is no problem of wire entanglement or disconnection, and no waste of copper wire occurs.

Reference numeral 31 shown in FIG. 1 is a head driving member. The head drive member 31 includes a plurality of drive arms 32, 3
Are extended, and the head assembly 21 is fixed to the tip of each drive arm 32. As shown in FIG. 8, the head driving member 31 rotates about an axis, whereby the head main body 22 moves from the inner peripheral side to the outer peripheral side of the disk D. A flexible printed circuit board 33 is adhered to a side surface of the head driving member 31, and a terminal board 34 extended from the flexible board 33 is extended to a front end of each drive arm 32. Top drive arm 32
In the figure, the terminal substrate 34 extends only on the lower surface, the terminal substrate 34 extends only on the upper surface of the lowermost drive arm 32, and the terminal substrate 34 extends on both the upper and lower surfaces of the intermediate drive arm 32. The terminal board 34 is adhesively fixed to a portion of the head assembly 21 facing the printed board 28.

The terminal board 34 has an electrode pattern 34 corresponding to the electrode pattern 28a of the head assembly 21 on a one-to-one basis.
are formed, and the electrode patterns 34a, 3a are formed.
The lead patterns 34c extending from 4a extend to the flexible printed circuit board 33 and are connected to other circuits in the disk drive. A through hole 32a is formed at the tip of the drive arm 32, and the terminal board 34
A hole 34b communicating with the through hole 32a is formed.

When the head assembly 21 is mounted on the lower surface of the uppermost drive arm 32, the caulking portion 27 of the mount member 26 is connected to the hole 34b of the terminal board 34 and the drive arm 32 as shown in FIG. It is inserted into the through hole 32a. Then, as shown in FIG. 3, a pressing force F is applied, and the projecting portion of the caulking portion 27 is caulked and fixed to the upper surface of the drive arm 32. At this time, the electrode patterns 28a, 28a on the head assembly 21 side and the electrode patterns 3 on the drive arm 32 side
4a and 34a are face-to-face joined by the pressing force F, and a conduction path from the coil C wound around the core 22b to the flexible printed circuit board 33 is formed. Electrode pattern 28a
And 34a are conducted by face-to-face bonding, but each electrode pattern is preferably formed of a metal film of gold, silver or the like in order to minimize the electrical resistance of this bonding part.
In the drive arm 32 in the middle of the head drive member 31,
The head assembly 21 is attached to the top and bottom surfaces of the tip. FIGS. 4 and 5 show the mounting structure in this case.

In FIG. 4, the head assembly 21 attached to the lower surface side of the drive arm 32 has the same orientation as that of FIG. 1, and the head body 22 attached to the front end of the load beam 25 faces downward. Reference numeral 22 faces the upper surface of the disk (see FIG. 9). The mount member 26a joined to the fixed portion 25c at the base of the load beam 25 faces downward and the printed circuit board 28 faces upward. The head assembly 21 mounted on the upper surface side of the drive arm 32 is turned upside down as shown in FIG. 1, the head body 22 at the front end of the load beam 25 faces upward, and the head body 22 faces the lower surface of the disk. I do. In the head assembly 21 mounted on the upper surface of the drive arm 32, the mount member 26a joined to the fixed portion 25c at the base of the load beam 25 is facing upward, and the printed circuit board 28 is facing downward. Drive arm 32
On the mount members 26a, 26a opposed to the upper and lower surfaces, cylindrical press-fit portions 27a, 27a having the same outer dimensions and the same axial length are formed. As shown in FIG. 4, the press-fitting portions 27a and 27a are press-fitted into the through-hole 32a of the drive arm 32 from both upper and lower directions, and at this time, the tips of the press-fitting portions 27a and 27a do not hit. In this press-fitting operation, the electrode patterns 34a, 34a... Located on the upper and lower surfaces of the drive arm 32 and the respective electrode patterns 28a, 28a.

In the embodiment shown in FIG. 5, the outer dimensions of the press-fitting portion 27b extending downward from the mount member 26b of the head assembly 21 above the drive arm 32 are adjusted to the inner peripheral surface of the through hole 32a of the drive arm 32. It is set so that it can be pressed. A press-fit portion 27c extending upward is formed on the mount member 26c of the lower head assembly 21, and the press-fit portion 27c is set to have an outer dimension that can be press-fit into the inner peripheral surface of the press-fit portion 27b. And both press-fit parts 27b and 2
7c are press-fitted in the through hole 32a so as to overlap each other. The electrode patterns 34a, 34a... And the electrode patterns 28a, 28a. Further, the head assembly 21 is mounted on the upper surface of the lowermost drive arm 32 of the head drive member 31 in an upside-down direction as shown in FIG. In this case, the caulking portion 27 is caulked and fixed to the drive arm 32. In the uppermost and lowermost head assemblies 21, the mount member 26 and the drive arm 32 may be fixed by press-fitting instead of swaging.

FIGS. 6 and 7 show a head assembly according to another embodiment of the present invention. Head assembly 2 shown in FIG.
In 1a, a flexible cable 35 on a film is fixed to the upper surface of the load beam 25 by means such as bonding. At the base on the flexible cable 35, electrode patterns 35c, 35c... Which are face-to-face joined to the drive arm side are formed, and the lead patterns 35a, 35a conducted to the electrode patterns 35c, 35c.
5 toward the front. In the example shown in FIG. 6, a thin film element 41 is provided on the trailing side end surface of the head main body 22, and the thin film element 41 forms a magnetic function part for recording and reproduction. In this case, the tip 35b of the flexible cable 35 can be extended to the trailing end of the head main body 22, and the electrode at the tip of the flexible cable 35 can be directly joined to the electrode of the thin film element 41.

In FIG. 6, the head body 22 is
In the case of the bulk type having the core 22b and the coil C shown in FIG. 7, the leading end of the flexible cable 35 is extended to the tip of the load beam 25, and the lead wire extending from the coil C is soldered to the land at the tip of the flexible cable 35. You can attach it. Head assembly 21b shown in FIG.
Is formed on the upper surface of the load beam 25 by directly applying an insulating resin thereon, and lead patterns 36a, 36a... And electrode patterns 36c, 36c. Land pattern 3 is applied to the tip of the insulating thin film 36.
6b, 36b... Are formed and lead wires or thin film elements 4 extending from the coil C of the bulk type head main body 22 are formed.
When using No. 1, a lead wire extending from the electrode is soldered to the land pattern.

In the structure shown in FIG. 6, since the flexible cable 35 using a resin film as a base material overlaps with the leaf spring function portion 25b of the load beam 35, the resin film of the flexible cable 35 is It affects the elastic force of 25b. Therefore, it may be necessary to change the thickness of the load beam 25 from the conventional one according to the setting of the initial pressing force between the head body 22 and the disk. However, in FIG. 7, the insulating resin is directly applied to the load beam 25 to form the insulating thin film 36 without using the film base material. Few. In each of the above embodiments, the head driving member 31 rotates about the axis, thereby moving the head main body from the inner peripheral side to the outer peripheral side of the disk, but the disk driving member operates linearly. There may be. In addition, the case where only one disk is used may be used, and the device is not limited to a hard disk, and any device in which a head body moves along a recording medium such as a magneto-optical disk device or a mini disk device may be used. The present invention can be applied to any model.

[0024]

According to the present invention, when the head assembly is mounted on the driving member, the wiring connection between the head assembly side and the driving member side is completed, and a lead wire is wired to the driving member side and soldered as in the prior art. The work of attaching is unnecessary. Further, since the wiring path does not become long unlike the related art, it is hardly affected by external noise.

Further, since the lead wire does not extend from the head assembly, the lead wire does not get entangled or cut during storage and management of the head assembly. In addition, since there is no unnecessary wiring portion, there is no waste of wiring material. Also book
In the invention, the direction perpendicular to the surface on which the electrode pattern is provided
The base of the support member approaches the drive member
An uneven fitting portion is provided for
The relative position between the base of the holding member and the driving member is determined,
At this time, a plurality of electrode pads provided on the support member and the drive member are used.
The turns are opposed from each other in the direction in which the uneven fitting portion is fitted.
They are pressed against each other. This allows the positioning of the support member and the electrode
Pressure contact conduction between patterns can be performed simultaneously.
In addition, the electrode pattern is formed from the direction in which the concave-convex fitting portion is fitted.
The electrode pattern is pressed from the facing direction for face-to-face pressure contact
Are connected and the electrode patterns are rubbed
Damage will not occur.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing a mounting portion between a head assembly and a drive arm in a hard disk drive as one embodiment of the present invention;

FIG. 2 is an exploded cross-sectional view of a joint between the head assembly and the drive arm of FIG. 1;

FIG. 3 is a sectional view showing a state in which the head assembly is attached to a drive arm in FIG. 1;

FIG. 4 is a cross-sectional view showing a state where a head assembly is attached to both upper and lower surfaces of a drive arm;

FIG. 5 is a cross-sectional view showing another structure when a head assembly is attached to both upper and lower surfaces of a drive arm.

FIG. 6 is a perspective view showing a head assembly according to a second embodiment of the present invention;

FIG. 7 is a perspective view showing a head assembly according to a third embodiment of the present invention;

FIG. 8 is a plan view showing a head drive unit of a conventional hard disk drive,

9 is a partial side view in the direction of the arrow IX in FIG. 8;

FIG. 10 is an enlarged side view showing a head body supporting portion of a conventional head assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Head assembly 22 Head main body 22a Slider 22b Core 23 Support member 24 Flexure 25 Load beam 25b Leaf spring function part 25c Fixed part 26 Mounting member 27 Caulking part 28 Printed circuit board 28a Electrode pattern 31 Head drive member 32 Drive arm 32a Through hole 34 Terminal board 34a Electrode pattern

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/60 G11B 21/16

Claims (4)

(57) [Claims] 1. A head body facing a recording medium, a supporting member having a head body attached to a front end, a driving member supporting a base of the supporting member and moving the head body along the recording medium. In the magnetic head driving device provided with a plurality of electrode patterns, a plurality of electrode patterns conducting to the magnetic function portion of the head main body are formed at the base of the support member, and a plurality of electrode patterns conducting to the external wiring are formed at the driving member. An uneven fitting portion is provided between the base of the member and the driving member to make the base of the supporting member approach the driving member in a direction perpendicular to the surface on which the electrode pattern is provided to fit the unevenness. When the base of the support member is assembled in the direction in which the concave and convex fitting portion is fitted to the drive member, the base of the support member is positioned on the drive member, Between the plurality of electrode patterns,
Face-to-face pressure contact from the direction in which the concave and convex fitting portion fits ,
At the same time when the base of the support member and the driving member are fixed,
A magnetic head driving device wherein the electrode patterns are electrically connected to each other . 2. A head body facing a recording medium, and a head portion.
A support member having a head body attached to the
The head body is supported along the recording medium while supporting the base of the material.
Magnetic head driving device provided with a driving member to be moved
In the base of the support member, the magnetic function part of the head body
A plurality of electrode patterns that are electrically connected to the
A plurality of electrode patterns that conduct to the lines are formed and the support
The electrode pattern is provided between the base of the member and the driving member.
The base of the support member in a direction perpendicular to the surface on which the
The caulked portion is brought close to the drive member and fitted
The provided uneven fitting portion is provided, and the support member
The base portion is fitted with the concave / convex fitting portion with the driving member.
The base of the support member when assembled in the direction
Are positioned on the drive member, and the plurality of
The direction in which the electrode patterns fit in the concave / convex fitting portion
Is facing pressure from, due to being caulked said caulking portion
Wherein the base of the support member and said driving member is fixed Te
At the same time, make sure that the electrode patterns are
Characteristic magnetic head driving device. 3. A head body facing a recording medium, and a head portion.
A support member having a head body attached to the
And supporting the base of the timber along said head body in a recording medium body
Magnetic head driving device provided with a driving member to be moved
In the base of the support member, the magnetic function part of the head body
A plurality of electrode patterns that are electrically connected to the
A plurality of electrode patterns that conduct to the lines are formed and the support
The electrode pattern is provided between the base of the member and the driving member.
The base of the support member in a direction perpendicular to the surface on which the
The concave / convex fitting portion for making the concave / convex fit close to the driving member
Wherein the base of the support member is
Is assembled in the direction in which the concave / convex fitting portion is fitted.
When the base of the support member is positioned on the drive member.
And the plurality of electrode patterns are
The concavo-convex fitting portion is face-to-face pressed from the fitting direction, and the press-fitting of the concavo-convex fitting portion fixes the base of the support member and the driving member, and at the same time, connects the electrode patterns.
Magnetic head driving device, wherein
Place. 4. A press-fit portion is formed at a base of the support member so as to protrude, and a through hole is formed at the drive member to form the concave-convex fitting portion. 4. The magnetic head driving device according to claim 3, wherein the press-fitting portion is press-fitted, and bases of the support members are respectively attached to both sides of the driving member.